/** 字符串截取 (保证表情不被截断)*/
+ (NSString *)subStringWith:(NSString *)string ToIndex:(NSInteger)index{
NSString *result = string;
if (result.length > index) {
NSRange rangeIndex = [result rangeOfComposedCharacterSequenceAtIndex:index];
result = [result substringToIndex:(rangeIndex.location)];
}
return result;
}
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